Oh, how do you figure? The traditional investment portion was to be some $8M (to bring the budget up to ~$10M), and is supposedly already lined up, modulo the initial funding goal (I believe Chris stated as much during one of the Reddit AMA's).
Moreover, of all the extended goal possibilities in the poll, which do you seriously believe would go toward bringing in new backers? More missions than before? More NPCs? I suspect that the lion's share of backers who would be swayed by those (and the "improved FPS mode"...) have already pledged. Also, are you Seumas on Kickstarter as well? If so, then of all people, you should realize that Linux support has a greatly different level of importance on a crowd-funding campaign (where the Linux community is heavily active) than the wider gaming world.